ParameterSet cannot handle boolean

[ye-luo]

Describe the bug
ParameterSet::add(bool) doesn't parse bool correctly.
The most funny logic is fliping value if the input entry is empty.

qmcpack/src/OhmmsData/OhmmsParameter.h

Line 171 in 41b802b

ref_ = !ref_; //flip the bit

Expected behavior
parse yes/no correctly

[prckent]

!!!

Presumably the fix will be to default to true if not present.

[ye-luo]

!!!

Presumably the fix will be to default to true if not present.

"yes"/"no" will be the only acceptable value, the code should stop if empty value is given.
if the whole entry is not given, it is the default value as listed in the manual.

[prckent]

Good solution.

There might be a few input files to update in our tests and examples.

[ye-luo]

Another observation #4126 (comment)